关键词: 道路工程, 高海拔地区, 温泉热能, 路面积雪, 暗冰, 苏霍夫公式

Abstract: The test section was built at exit end of Queershan Tunnel. PVC pipes and steel pipes were laid on the surface of concrete pavement with spacing 24cm and 40cm respectively. The temperature values of road surface at different times and rock mass with different buried depth after the hot water of hot spring passing through two kinds of pipelines were measured, and the changes of ice and snow cover on pavement were observed and recorded. The feasibility of using thermal energy of hot spring to eliminate snow cover and dark ice on tunnel entrance pavement in high altitude area in winter was studied. The temperature drop effect of fluid passing through pipelines made of different materials was compared and analyzed. The results show that in the test section of steel pipe and PVC pipe, the ice and snow layer of pavement begins to melt after 20 and 24 hours of hot spring water passing, and the ice and snow layer of pavement melts completely after 48 and 96 hours of hot spring water passing. For shallow pavement, the heating rate of steel tube test section is faster than that of PVC tube test section in heating process, and the steel tube system with 40 cm spacing is more effective than that with 24 cm spacing. A modified Sukhov temperature drop calculation formula considering the material of the pipeline is proposed. The correction coefficients of PVC pipe and steel pipe are 1.8 and 0.9 respectively based on the temperature drop test data of PVC pipe and steel pipe, which can provide reference for the reasonable determination of the design parameters of pavement snow melting and ice melting in high altitude regions.

Key words: highway engineering, high altitude region, thermal energy of hot spring, snowy pavement, dark ice, Sukhov formula